| O29199 | Other cardiac complications of anesthesia during pregnancy, unspecified trimester |
| O292 | Central nervous system complications of anesthesia during pregnancy |
| O2921 | Cerebral anoxia due to anesthesia during pregnancy |
| O29211 | Cerebral anoxia due to anesthesia during pregnancy, first trimester |
| O29212 | Cerebral anoxia due to anesthesia during pregnancy, second trimester |
| O29213 | Cerebral anoxia due to anesthesia during pregnancy, third trimester |
| O29219 | Cerebral anoxia due to anesthesia during pregnancy, unspecified trimester |
| O2929 | Other central nervous system complications of anesthesia during pregnancy |
| O29291 | Other central nervous system complications of anesthesia during pregnancy, first trimester |
| O29292 | Other central nervous system complications of anesthesia during pregnancy, second trimester |
| O29293 | Other central nervous system complications of anesthesia during pregnancy, third trimester |
| O29299 | Oth cnsl comp of anesthesia during pregnancy, unsp trimester Other central nervous system complications of anesthesia during pregnancy, unspecified trimester |
| O293 | Toxic reaction to local anesthesia during pregnancy |
| O293X | Toxic reaction to local anesthesia during pregnancy |
| O293X1 | Toxic reaction to local anesthesia during pregnancy, first trimester |
| O293X2 | Toxic reaction to local anesth during preg, second trimester Toxic reaction to local anesthesia during pregnancy, second trimester |
| O293X3 | Toxic reaction to local anesthesia during pregnancy, third trimester |
| O293X9 | Toxic reaction to local anesthesia during pregnancy, unspecified trimester |
| O294 | Spinal and epidural anesth induced headache during pregnancy Spinal and epidural anesthesia induced headache during pregnancy |
| O2940 | Spinal and epidur anesth induce hdache during preg, unsp tri Spinal and epidural anesthesia induced headache during pregnancy, unspecified trimester |
| O2941 | Spinal and epidural anesthesia induced headache during pregnancy, first trimester |
| O2942 | Spinal and epidural anesthesia induced headache during pregnancy, second trimester |
| O2943 | Spinal and epidural anesthesia induced headache during pregnancy, third trimester |
| O295 | Other complications of spinal and epidural anesthesia during pregnancy |
| O295X | Other complications of spinal and epidural anesthesia during pregnancy |
| O295X1 | Other complications of spinal and epidural anesthesia during pregnancy, first trimester |
| O295X2 | Oth comp of spinal and epidur anesth during preg, second tri Other complications of spinal and epidural anesthesia during pregnancy, second trimester |
| O295X3 | Other complications of spinal and epidural anesthesia during pregnancy, third trimester |
| O295X9 | Oth comp of spinal and epidural anesth during preg, unsp tri Other complications of spinal and epidural anesthesia during pregnancy, unspecified trimester |
| O296 | Failed or difficult intubation for anesthesia during pregnancy |
| O2960 | Failed or difficult intubation for anesth dur preg, unsp tri Failed or difficult intubation for anesthesia during pregnancy, unspecified trimester |
| O2961 | Failed or difficult intubation for anesthesia during pregnancy, first trimester |
| O2962 | Fail or difficult intubation for anesth dur preg, second tri Failed or difficult intubation for anesthesia during pregnancy, second trimester |
| O2963 | Failed or difficult intubation for anesthesia during pregnancy, third trimester |
| O298 | Other complications of anesthesia during pregnancy |
| O298X | Other complications of anesthesia during pregnancy |
| O298X1 | Other complications of anesthesia during pregnancy, first trimester |
| O298X2 | Other complications of anesthesia during pregnancy, second trimester |
| O298X3 | Other complications of anesthesia during pregnancy, third trimester |
| O298X9 | Other complications of anesthesia during pregnancy, unspecified trimester |
| O299 | Unspecified complication of anesthesia during pregnancy |
| O2990 | Unspecified complication of anesthesia during pregnancy, unspecified trimester |
| O2991 | Unspecified complication of anesthesia during pregnancy, first trimester |
| O2992 | Unspecified complication of anesthesia during pregnancy, second trimester |
| O2993 | Unspecified complication of anesthesia during pregnancy, third trimester |
| O30 | Multiple gestation |
| O300 | Twin pregnancy |
| O3000 | Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs |
| O30001 | Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimester |
| O30002 | Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimester |